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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7e834f3717571499ec4d51d075258d1104d9d4c28cafddb4079e6b01eb1d2c4' 
  AND token = 'pTGXsnaZArfW4MGxY6Ph72cNc+w6wZI5xEqMNGbscPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}